144 
ECTOCARPx\CEiE. — Ectocarpus. 
iv. 
This forms dark brown, rope-like tufts, not unlike some states of E. tomentosus , 
but the filaments are much more robust than in that species. The numerous spine- 
like ramuli resemble those of E. Landsburgii , but are less abundant ; and the 
articulations are much longer than those of that species. It appears to me to be 
sufficiently characterized, and I hope its discoverer may be able to ascertain the 
place where his specimen was obtained, and may find it again. At present I have 
seen but one specimen ; Mr. Hooper informs me that he has no duplicate. 
Plate XII. E., Fig. 1 . Portion of a filament of Ectocarpus Hooperi , magnified ; 
fig. 2, minute portion, more highly magnified. 
13. Ectocarpus Dietzice ; tufts entangled, floccose ; filaments robust, very flaccid, 
elongate, slightly and distantly branched, subdichotomous (?), flexuous, here and 
there emitting dichotomous branches ; ramuli few, subulate ; articulations of the 
branches once and half as long as broad. 
Greenport, Herb. J. Hooper, (v. s.) 
Forming a pale green, entangled, very flaccid tuft, 4 — 5 inches long, with the 
habit of E. pusillus or of E. crinitus. It seems different from any species of North 
America with which I am acquainted, but is not sufficiently defined by the above 
diagnosis. I have seen but one specimen, which adheres so closely to the paper, that 
it is difficult to remove fragments for examination, and I have found it impossible 
to display the portion examined, so as to enable me clearly to trace the order of 
branching. This imperfect examination, and the absence of fructification, compel me 
to place the species, at present, among the doubtful ones, but I trust more perfect 
specimens may eventually be obtained. Meantime, the specific name is bestowed in 
honour of Mrs. Dietz, of New York ; a lady whose diligent researches in marine 
botany entitle her to this token of respect from fellow-labourers. 
